Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments
Antarctic sea-ice plays a primary role in the climate system, potentially modulating interhemispheric millennial-scale climate change and deglacial warming. Recently, microfossil proxy data have provided important insights into this potential forcing. However, additional proxies for glacial sea-ice...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/502225/ https://doi.org/10.1016/j.quascirev.2013.02.004 |
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ftnerc:oai:nora.nerc.ac.uk:502225 2024-02-11T09:58:43+01:00 Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments Collins, Lewis G. Allen, Claire S. Pike, Jennifer Hodgson, Dominic A. Weckström, Kaarina Massé, Guillaume 2013-11-01 http://nora.nerc.ac.uk/id/eprint/502225/ https://doi.org/10.1016/j.quascirev.2013.02.004 unknown Collins, Lewis G.; Allen, Claire S. orcid:0000-0002-0938-0551 Pike, Jennifer; Hodgson, Dominic A. orcid:0000-0002-3841-3746 Weckström, Kaarina; Massé, Guillaume. 2013 Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments. Quaternary Science Reviews, 79. 87-98. https://doi.org/10.1016/j.quascirev.2013.02.004 <https://doi.org/10.1016/j.quascirev.2013.02.004> Meteorology and Climatology Chemistry Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1016/j.quascirev.2013.02.004 2024-01-19T00:03:13Z Antarctic sea-ice plays a primary role in the climate system, potentially modulating interhemispheric millennial-scale climate change and deglacial warming. Recently, microfossil proxy data have provided important insights into this potential forcing. However, additional proxies for glacial sea-ice reconstructions are required, to support the microfossil data and to control for potential preservation issues. We considered highly branched isoprenoids (HBIs) as a sea-ice proxy, building on earlier studies in the Arctic and Antarctic. This study focused on measuring HBIs in glacial deposits in Southern Ocean deep ocean sediment cores. These deep ocean sites provided a study location away from the local sea-ice complexities associated with coastal and shallow water sites and allowed the comparison of HBIs during several phases of glacial sea-ice variability inferred from microfossils. Down-core profiles of di- and tri-unsaturated HBI isomers diene II and triene III were compared with diatom-based reconstructions of Antarctic sea-ice derived in three high resolution sediment cores recovered from a transect across the Scotia Sea, Southwest Atlantic. High quality chronological control was achieved through a combination of abundance stratigraphy, relative geomagnetic palaeointensity data, and down-core magnetic susceptibility/ice core dust correlation. Significant positive correlations, observed between HBI diene II and sea-ice presence, and between HBI triene III and open waters in the Marginal Ice Zone indicated that the two HBIs are both closely related to sea-ice and sea-ice edge dynamics, respectively. Highly significant down-core correlations between the HBIs indicate coeval sedimentation related to the summer breakdown of sea-ice melt-induced stratification. Combined, the two HBIs and diatoms demonstrated their potential as proxies for permanent sea-ice cover and sea-ice seasonality, two parameters poorly resolved in current climate models. The sea-ice reconstructions presented have developed our knowledge ... Article in Journal/Newspaper Antarc* Antarctic Arctic Climate change ice core Magnetic susceptibility Scotia Sea Sea ice Southern Ocean Natural Environment Research Council: NERC Open Research Archive Arctic Antarctic Southern Ocean Scotia Sea Quaternary Science Reviews 79 87 98 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology Chemistry |
spellingShingle |
Meteorology and Climatology Chemistry Collins, Lewis G. Allen, Claire S. Pike, Jennifer Hodgson, Dominic A. Weckström, Kaarina Massé, Guillaume Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
topic_facet |
Meteorology and Climatology Chemistry |
description |
Antarctic sea-ice plays a primary role in the climate system, potentially modulating interhemispheric millennial-scale climate change and deglacial warming. Recently, microfossil proxy data have provided important insights into this potential forcing. However, additional proxies for glacial sea-ice reconstructions are required, to support the microfossil data and to control for potential preservation issues. We considered highly branched isoprenoids (HBIs) as a sea-ice proxy, building on earlier studies in the Arctic and Antarctic. This study focused on measuring HBIs in glacial deposits in Southern Ocean deep ocean sediment cores. These deep ocean sites provided a study location away from the local sea-ice complexities associated with coastal and shallow water sites and allowed the comparison of HBIs during several phases of glacial sea-ice variability inferred from microfossils. Down-core profiles of di- and tri-unsaturated HBI isomers diene II and triene III were compared with diatom-based reconstructions of Antarctic sea-ice derived in three high resolution sediment cores recovered from a transect across the Scotia Sea, Southwest Atlantic. High quality chronological control was achieved through a combination of abundance stratigraphy, relative geomagnetic palaeointensity data, and down-core magnetic susceptibility/ice core dust correlation. Significant positive correlations, observed between HBI diene II and sea-ice presence, and between HBI triene III and open waters in the Marginal Ice Zone indicated that the two HBIs are both closely related to sea-ice and sea-ice edge dynamics, respectively. Highly significant down-core correlations between the HBIs indicate coeval sedimentation related to the summer breakdown of sea-ice melt-induced stratification. Combined, the two HBIs and diatoms demonstrated their potential as proxies for permanent sea-ice cover and sea-ice seasonality, two parameters poorly resolved in current climate models. The sea-ice reconstructions presented have developed our knowledge ... |
format |
Article in Journal/Newspaper |
author |
Collins, Lewis G. Allen, Claire S. Pike, Jennifer Hodgson, Dominic A. Weckström, Kaarina Massé, Guillaume |
author_facet |
Collins, Lewis G. Allen, Claire S. Pike, Jennifer Hodgson, Dominic A. Weckström, Kaarina Massé, Guillaume |
author_sort |
Collins, Lewis G. |
title |
Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
title_short |
Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
title_full |
Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
title_fullStr |
Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
title_full_unstemmed |
Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments |
title_sort |
evaluating highly branched isoprenoid (hbi) biomarkers as a novel antarctic sea-ice proxy in deep ocean glacial age sediments |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502225/ https://doi.org/10.1016/j.quascirev.2013.02.004 |
geographic |
Arctic Antarctic Southern Ocean Scotia Sea |
geographic_facet |
Arctic Antarctic Southern Ocean Scotia Sea |
genre |
Antarc* Antarctic Arctic Climate change ice core Magnetic susceptibility Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Arctic Climate change ice core Magnetic susceptibility Scotia Sea Sea ice Southern Ocean |
op_relation |
Collins, Lewis G.; Allen, Claire S. orcid:0000-0002-0938-0551 Pike, Jennifer; Hodgson, Dominic A. orcid:0000-0002-3841-3746 Weckström, Kaarina; Massé, Guillaume. 2013 Evaluating highly branched isoprenoid (HBI) biomarkers as a novel Antarctic sea-ice proxy in deep ocean glacial age sediments. Quaternary Science Reviews, 79. 87-98. https://doi.org/10.1016/j.quascirev.2013.02.004 <https://doi.org/10.1016/j.quascirev.2013.02.004> |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.02.004 |
container_title |
Quaternary Science Reviews |
container_volume |
79 |
container_start_page |
87 |
op_container_end_page |
98 |
_version_ |
1790594466536488960 |